How to calculate BMI (Body Mass Index)

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Body Mass Index (BMI) is a measure of body fat based on an individual’s weight and height. It is commonly used to assess whether a person has a healthy body weight or is underweight, overweight, or obese. Calculating BMI involves a simple mathematical formula that can be done manually or using online calculators.

The formula for calculating BMI is as follows:

BMI = weight (kg) / (height (m))^2

To calculate BMI manually, follow these steps:

1. Convert your weight from pounds to kilograms by dividing it by 2.205.
2. Convert your height from inches to meters by multiplying it by 0.0254.
3. Square the value obtained in step 2.
4. Divide the weight in kilograms obtained in step 1 by the squared height value obtained in step 3.

For example, let’s say a person weighs 150 pounds and their height is 5 feet 6 inches (66 inches). The calculation would be as follows:

1. Weight in kilograms: 150 / 2.205 = 68.04 kg
2. Height in meters: 66 * 0.0254 = 1.6764 m
3. Squared height: 1.6764^2 = 2.8127
4. BMI: 68.04 / 2.8127 = 24.18

In this example, the person’s BMI is approximately 24.18, which falls within the normal weight range.

It’s important to note that BMI is a general indicator and does not take into account factors such as muscle mass, bone density, or distribution of fat, which can vary among individuals. Therefore, it should be used as a screening tool rather than a definitive measure of health.

Online calculators are widely available and can simplify the process of calculating BMI. These calculators typically require you to input your weight and height, and they will automatically calculate your BMI using the formula mentioned above.

Top 3 Authoritative Reference Publications or Domain Names Used:

1. Mayo Clinic –
2. Centers for Disease Control and Prevention (CDC) –
3. World Health Organization (WHO) –


Arbaj Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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